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fix: the cache problem in tabs mode;:bug:
修复：多页签模式下的缓存问题；
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,141 @@ | ||
| import {isDef, isRegExp, remove} from '@/utils/util' | ||
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| const patternTypes = [String, RegExp, Array] | ||
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| function matches (pattern, name) { | ||
| if (Array.isArray(pattern)) { | ||
| return pattern.indexOf(name) > -1 | ||
| } else if (typeof pattern === 'string') { | ||
| return pattern.split(',').indexOf(name) > -1 | ||
| } else if (isRegExp(pattern)) { | ||
| return pattern.test(name) | ||
| } | ||
| /* istanbul ignore next */ | ||
| return false | ||
| } | ||
|
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| function getComponentName (opts) { | ||
| return opts && (opts.Ctor.options.name || opts.tag) | ||
| } | ||
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| function getFirstComponentChild (children) { | ||
| if (Array.isArray(children)) { | ||
| for (let i = 0; i < children.length; i++) { | ||
| const c = children[i] | ||
| if (isDef(c) && (isDef(c.componentOptions) || c.isAsyncPlaceholder)) { | ||
| return c | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| function pruneCache (keepAliveInstance, filter) { | ||
| const { cache, keys, _vnode } = keepAliveInstance | ||
| for (const key in cache) { | ||
| const cachedNode = cache[key] | ||
| if (cachedNode) { | ||
| const name = getComponentName(cachedNode.componentOptions) | ||
| if (name && !filter(name)) { | ||
| pruneCacheEntry(cache, key, keys, _vnode) | ||
| } | ||
| } | ||
| } | ||
| } | ||
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| function pruneCacheEntry (cache, key, keys, current) { | ||
| const cached = cache[key] | ||
| if (cached && (!current || cached.tag !== current.tag)) { | ||
| cached.componentInstance.$destroy() | ||
| } | ||
| cache[key] = null | ||
| remove(keys, key) | ||
| } | ||
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| export default { | ||
| name: 'AKeepAlive', | ||
| abstract: true, | ||
| model: { | ||
| prop: 'clearCaches', | ||
| event: 'clear', | ||
| }, | ||
| props: { | ||
| include: patternTypes, | ||
| exclude: patternTypes, | ||
| max: [String, Number], | ||
| clearCaches: Array | ||
| }, | ||
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| watch: { | ||
| clearCaches: function(val) { | ||
| if (val && val.length > 0) { | ||
| const {cache, keys} = this | ||
| val.forEach(key => { | ||
| pruneCacheEntry(cache, key, keys, this._vnode) | ||
| }) | ||
| this.$emit('clear', []) | ||
| } | ||
| } | ||
| }, | ||
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| created() { | ||
| this.cache = Object.create(null) | ||
| this.keys = [] | ||
| }, | ||
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| destroyed () { | ||
| for (const key in this.cache) { | ||
| pruneCacheEntry(this.cache, key, this.keys) | ||
| } | ||
| }, | ||
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| mounted () { | ||
| this.$watch('include', val => { | ||
| pruneCache(this, name => matches(val, name)) | ||
| }) | ||
| this.$watch('exclude', val => { | ||
| pruneCache(this, name => !matches(val, name)) | ||
| }) | ||
| }, | ||
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| render () { | ||
| const slot = this.$slots.default | ||
| const vnode = getFirstComponentChild(slot) | ||
| const componentOptions = vnode && vnode.componentOptions | ||
| if (componentOptions) { | ||
| // check pattern | ||
| const name = getComponentName(componentOptions) | ||
| const { include, exclude } = this | ||
| if ( | ||
| // not included | ||
| (include && (!name || !matches(include, name))) || | ||
| // excluded | ||
| (exclude && name && matches(exclude, name)) | ||
| ) { | ||
| return vnode | ||
| } | ||
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| const { cache, keys } = this | ||
| const key = vnode.key == null | ||
| // same constructor may get registered as different local components | ||
| // so cid alone is not enough (#3269) | ||
| ? componentOptions.Ctor.cid + (componentOptions.tag ? `::${componentOptions.tag}` : '') | ||
| : vnode.key | ||
| if (cache[key]) { | ||
| vnode.componentInstance = cache[key].componentInstance | ||
| // make current key freshest | ||
| remove(keys, key) | ||
| keys.push(key) | ||
| } else { | ||
| cache[key] = vnode | ||
| keys.push(key) | ||
| // prune oldest entry | ||
| if (this.max && keys.length > parseInt(this.max)) { | ||
| pruneCacheEntry(cache, keys[0], keys, this._vnode) | ||
| } | ||
| } | ||
|
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||
| vnode.data.keepAlive = true | ||
| } | ||
| return vnode || (slot && slot[0]) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,21 @@ | ||
| export function isDef (v){ | ||
| return v !== undefined && v !== null | ||
| } | ||
|
|
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| /** | ||
| * Remove an item from an array. | ||
| */ | ||
| export function remove (arr, item) { | ||
| if (arr.length) { | ||
| const index = arr.indexOf(item) | ||
| if (index > -1) { | ||
| return arr.splice(index, 1) | ||
| } | ||
| } | ||
| } | ||
|
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| export function isRegExp (v) { | ||
| return _toString.call(v) === '[object RegExp]' | ||
| } | ||
|
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| const _toString = Object.prototype.toString |